Electric switch



2, 1930.1 A. KRASTIN I 1,783,656

ELECTRIC SWI TCH Filed A ril 4, 1928 Patented D 2,-193 I v UN T D T I OFFICE I CLEVELANDQOHFIQQ if A a jApplicatiohfiiledgApril 4; ig i sg i it This invention relates 1 to electric circuit 7 also 'conti uous with the wall. portion i; control switches. The {general object is to Thes'ide wafis have ears or brackets 8 turned provide a switch which'may be economically j outwardly therefrom, as shown in Fig. 1, by manufactured from asmallnumberof'parts, 'which'the casing may be supported, as by 5 and which will bece'rta in" in operation both screws (not shown) inserted through opento open and close an electric circuitfifA'speings 8 in the ears. The side wall portions ,cific object is to provide a simple "effective 15 of the casing are held in position by rivet-' device in conn ction with'an operating arm ingover the ends ofjthe pin 16 as at'16"; of an electric switch, for insuring certainty The'spring contacts lO are supported on -10 of the arm. A further'objec t is to provide one of theaendi wall portions 6 as shown para simple device for preventing displacement ticularly-in-Figtfi, wherein areshown a pair of the operating arm return spring; of insulating strips 11 one on each side of Further objects and features ofthe inventhis'wall portion '6. rThe attached ends of tion-will become apparent from the followthe strips lOwverl-iethe innermost insulati5 ing description relating to the accompanying strip andzmaybe securedin place-by ing drawings, wherein I have shown my preindividual-rivets 12'Tinternally threaded for i ferred form. The" essential characteristics the reception of respectivebinder screwsil3 will be summarized in the claims. v for holding theQconductor wires in place.

In the drawing, Fig. 1 is a, planview of One-of such: wires is shown-at 14; The free 1"20 th present embodiment of the invention; ends ofthe'strips lOare doubled to form the Figs. 2 and 3 are longitudinal cross sectional n a t surf l f V h h i0n 1 Views taken along the lines 2 -2 and 3-3 on b r 18,prev o sly-mentioned, moves with a Fig. l respectively; and Fig. 4 is a fragmen- Wiping action], The operating position--of i tary detail view of the switchoperating arm the bar 18 closi the circuit .is illusaoiandsupport thereof. I I 'trated inFig. 3. 5 The switch, as shown, includes a casing 1, I For returning the jarmll'5 toiits normal adapted tobe mounted on any suitable sup- "PQSIUOII' after each-actuation, I (employ a port and arranged to'contain-a'pair'of strip "1W118 sprmg 19' 'whichl is. substantially bi spring contacts 10. Th contact ar laeed symmetrical relative to the plane of move- 0 parallel to each other and in a common plane, Inent ofthe arm, the springhaving a centrali' and are arranged to be electricallyeconnected s retch 20 hearing against. one edge of the by a t l ba 18 c r i d o n arm 15;; d .-tarm,:; and contiguous coils-21 surrounding electrically insulated therefrom, the arm besthcipinflfi, the;ends 22jQf the pring being ing pivotally mounted upon a-rcross "pin16 fretainedbeneath lugs 23 upstruckfrom the l 35 supported .in'the side walls 5 of the/casing. side walls 5tof the casing;

The casing l is preferably a single piec one ofthe novelfeatures of the -presentin shell 'made 'up'of pressed sheet metal. ln- 'vention' is the device which I use for1prethe position shown, the casingis entirely '1 venting the arm 15 from displacement along open'at the top, and it maybe assumed that the apint16; -This r'device comprises under- 1140 the line A designates a supporting surface cutting'the pinlir16 asilat 17 and providingF5 whereby, in fconjunction with thecasing an opening 26 ini the arm largeenough to walls, thepartsinteriorlyof the easing are-fSlip over one end ofthepinJ The peripheral completely =housed. The I lowermost wall edges'ofthe-opemngam retainedgin posi- 1 portion ofthe casing is designated l. The; tion inth'e undercut 17 byreason ofthe re- 0 (45 side walls '5. are contiguous with the portion action of thespring which forces thegnpper 3 i and are sheared out of the sheet metalblank endtgof:, the arm-fto the" right as shownjn in the contour shown in Fig. 2, and bent up :nFig. 2,?holding thepopening in eccentric r eto lie parallel with veach other, as shown in v l'ationlto"the pin." Th'eifreeend To f the arm. Fig- 1,. their end marginaledges abutting is guided in arslot 27kinqthe b'ottjonrwallj 4- L159 upwardly extending end wall portions 6 andfof theiliousingi i flhegparticular advantage carried by the arm having an opening adaptedto of the above device is that while it does not materially increase the manufacturing cost, or the cost of assembly, it insures the bar 18 making even contact with both surfaces.

In Fig. 4 I have shown the undercut portion 17 of the pin 16 beveled as at 17 the result of this being that in case the arm has a tendency to ride up out of the undercut, it will be cammed down onto the smaller diameter by the beveled surfaces.

A further refinement of the switch is that the intermediate portion 20 of the spring is retained against movement along the edge of the arm 15. The refinement consists simply in placing shallow notches 28 on opposite edges of the arm 15. The reason for thelplurality of notches is that this makes itrunnecessary for the workmen, when assembling the switchto take notice which edge of the arm is toward the spring.

I claim:

1. In an electric switch,;a casing, apin intermediately of its ends, an arm=pivotally mounted upon the pin and having athrough opening loosely fitting the pin at the reduced portion, electric conductive means. carried by the-arm and electrically insulated from the arm, and a pair of spring contacts casing in position to be engaged by said means in one position of the arm.

2. In an electric switch, a casing, a pin carried by the casing: and having) a peripheral groove intermediately of its-ends, an

arm having an. enlarged opening adaptedto by preventingdisplacement of the arm along the pin. 7

3. In an electric switch, a casing, a pin carried by the casing andihaving a peripheral groove intermediately of its ends, an embrace the pin, the opening being'large enough to permit the arm to be assembled on'the pin lengthwise thereof, said arm being adapted to make and break an electric circuit, one wall of the casing having a slot embracing the-arm for guiding the movement thereof and located in the plane of said groove.

4. In an electric switch, a casing, carried by the casing, an arm pivotally carriedby the pin and adapted to open and. close an electric circuit, said pin having a.

peripheral groove,

and the arm having an openlng embracing the pin at said groove but large enough to enable the arm to be; moved for a considerabledistance along the arranged to act on the arm to hold it ina definite position, said pin, spring means signature, carried thereby having a reduced portion a pin.

spring means also acting on the arm to hold the opening thereof in eccentric relation to the pin, whereby the attached end of the arm is normally prevented from moving along the pin.

5 An electric switch comprising in combination, a casing, a pin carried byv the casing and. extending theretl1rough an arm pivotally carried on the pin, and adapted to make and break an electric circuit when moved-totwo different positions, there being a coil spring surrounding the pin at each side of the arm and having a portion thereof connecting the coils and bearing against one edge of the arm to maintain the arm in a definiteposition, relative to the casing, said arm having a notch adapted to receive said connectingportion of the spring, whereby said connecting portion, is preventedfrom displacement along the; arm.,

In testimony whereof, I hereunto affix my AUGUST KRAsrIN. 

